Projection optical system

a technology of projection optical system and projection lens, which is applied in the field of projection optical system, can solve the problems of difficult to achieve a wider angle, cannot be done without lengthening the focal length of the refractive lens group, and the lopsided positive direction of the projection sum, so as to achieve good optical performance, large screen, and advantageous in terms of mass production and cost

a technology of projection optical system and projection lens, which is applied in the field of projection optical system, can solve the problems of difficult to achieve a wider angle, cannot be done without lengthening the focal length of the refractive lens group, and the lopsided positive direction of the projection sum, so as to achieve good optical performance, large screen, and advantageous in terms of mass production and cost

US7239452B2Active Publication Date: 2007-07-03KONICA MINOLTA OPTO
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  • Projection optical system
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[0090]Hereinafter, practical examples of projection optical systems embodying the present invention will be presented with reference to their construction data and other data. Examples 1 to 4 presented below are numerical examples corresponding to the first to fourth embodiments described above, and the optical construction diagrams (FIGS. 1 to 8) showing the embodiments also show the optical arrangement, projection optical path, and other features of the corresponding examples.

[0091]Tables 1 to 4, Tables 5 to 8, Tables 9 to 12, and Tables 13 to 16 show the optical construction of Examples 1 to 4, respectively. Of these tables, Tables 1 and 2, Tables 5 and 6, Tables 9 and 10, and Tables 13 and 14 show, in the form of construction data, the optical arrangement of the entire system, specifically from the primary image surface SO (corresponding to the object surface in enlargement projection) on the reduction side to the secondary image surface SI (corresponding to the image surface in...

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Abstract

A projection optical system for performing enlargement projection from a primary image surface on the reduction side to a secondary image surface on the enlargement side has, from the primary image surface side, a lens optical system including two or more lens elements sharing a common rotation-symmetry axis and each having an optical power, a first reflective optical element having an optical power, and a second reflective optical element having a negative optical power. The projection optical system is non-telecentric toward the reduction side, and a prescribed condition is.

Description

[0001]This application is based on Japanese Patent Application No. 2004-119501 filed on Apr. 14, 2004, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a projection optical system, and more particularly to a projection optical system that incorporates reflective and refractive optical elements in an optical construction suitable for rear projection.[0004]2. Description of Related Art[0005]In a projection optical system for performing wide-angle enlargement projection from a primary image surface on the reduction side to a secondary image surface on the enlargement side, disposing in the optical path a negative mirror closer to the secondary image surface is effective in reducing chromatic aberration and distortion. Projection optical systems including a negative mirror for reducing chromatic and other aberrations are proposed, for example, in Patent Publications 1 to 3 listed b...

Claims

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Application Information

Patent Timeline
03 Jul 2007
Publication
US7239452B2
IPC
G02B9/00; G03B21/22; G03B21/28; G02B17/08; G02B13/08
CPC
G02B13/08; G02B17/0832; G02B17/0852
Inventors
KUWA, TOMIEI